docs: remove unnecessary step (#62)

This step is not needed, because the cache is already managed by `bazel-contrib/.github/.github/workflows`
bazel-contrib · Jan 26, 2024 · abde641 · abde641
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commit abde641
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diff --git a/README.md b/README.md
@@ -25,7 +25,6 @@ Ready to get started? Copy this repo, then
 1. rename directory "mylang" similarly
 1. run `pre-commit install` to get lints (see CONTRIBUTING.md)
 1. if you don't need to fetch platform-dependent tools, then remove anything toolchain-related.
-1. update the `actions/cache@v2` bazel cache key in [.github/workflows/ci.yaml](.github/workflows/ci.yaml) and [.github/workflows/release.yml](.github/workflows/release.yml) to be a hash of your source files.
 1. (optional) install the [Renovate app](https://github.com/apps/renovate) to get auto-PRs to keep the dependencies up-to-date.
 1. delete this section of the README (everything up to the SNIP).